Meteorological and oceanographic conditions in the northern Adriatic Sea during the period June 1999–July 2002: Influence on the mucilage phenomenon

Russo, Aniello; Maccaferri, S.; Djakovac, Tamara; Robert, Paul; Degobbis, Danilo; Deserti, Marco; Paschini, E.; Lyons, Daniel Mark

doi:10.1016/j.scitotenv.2005.09.058

Cited by 61 publications

(47 citation statements)

References 15 publications

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“…These factors govern circulation and lead to summer water-column stratification, hindering oxygen exchange between surface and bottom water (Degobbis et al 1995, Supić et al 2002. During periods of persistent stratification, DO drops rapidly in the bottom water due to respiration, benthic recycling of nutrients, and bacterial decomposition (Zavatarelli et al 1998, Russo et al 2005.…”

Section: Methodsmentioning

confidence: 99%

“…The occasionally low DO concentrations in the open configuration (minimum 2.6 ml l -1 ) agree with previously recorded near-bottom autumn values (Stachowitsch 1991, Artegiani et al 1997) and reflect the high oxygen demand of bacterial remineralisation and benthic respiration in periods with stratification (Herndl et al 1989). Fluctuating concentrations and peak values reflect vertical mixing due to storms (Russo et al 2005). Although DO concentrations are expected to be higher 20 cm above the sediment than directly at the bottom (Dade et al 2001), in 2 deployments a reverse situation was observed.…”

Section: Sensor Data and Biomassmentioning

confidence: 99%

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Behaviour and mortality of benthic crustaceans in response to experimentally induced hypoxia and anoxia in situ

Haselmair¹,

Stachowitsch²,

Zuschin³

et al. 2010

Mar. Ecol. Prog. Ser.

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Crustaceans are sensitive to hypoxia and are therefore useful indicator organisms for oxygen depletions. We used the experimental anoxia generating unit in the northern Adriatic Sea to artificially induce and document hypoxia and anoxia on a small scale (0.25 m 2 per deployment). Behavioural responses and mortalities were documented for 9 crustacean species typical for the sublittoral soft bottom of the Gulf of Trieste. All species showed a similar succession of atypical responses, albeit at different thresholds. The first reaction to declining dissolved oxygen (DO) was avoidance by climbing to more oxygenated (higher) positions. The animals left their shelters, altered their activity patterns, and exposed themselves to a higher risk of predation at mild hypoxia (2 to 1 ml l -1 DO). Moderate hypoxia (1 to 0.5 ml l -1 DO) triggered changes in inter-and intraspecific interactions, resulting in aggregations of up to 27 individuals at the highest elevations. At severe hypoxia (0.5 to 0.01 ml l -1 DO), sublethal responses such as discarding of camouflage (Ethusa mascarone) were recorded, and 54% of all crustaceans died. Anoxia left most remaining individuals immobile and moribund until death. Almost all responses were related to DO thresholds -hydrogen sulphide (H 2 S) had not yet evolved. Pisidia longimana, Galathea spp., and Macropodia spp. were the most sensitive; Pilumnus spinifer and Ebalia tuberosa were the somewhat more tolerant species. Only Nepinnotheres pinnotheres survived prolonged anoxia as well as high H 2 S concentrations.

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Section: Methodsmentioning

confidence: 99%

Section: Sensor Data and Biomassmentioning

confidence: 99%

Behaviour and mortality of benthic crustaceans in response to experimentally induced hypoxia and anoxia in situ

Haselmair¹,

Stachowitsch²,

Zuschin³

et al. 2010

Mar. Ecol. Prog. Ser.

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“…337 10A). The trend-cycle component showed a strong non-seasonal increase in temperature 338 during January-February 2001, which is presumably the result of a warmer-than-average 339 winter and low surface cooling (Russo et al, 2005). This increase in temperature was 340 followed by an increase in bacterial production, as well as oxygen saturation, which suggests 341 an increase in primary production (Fig.…”

Section: Accepted Manuscriptmentioning

confidence: 96%

The role of water mass dynamics in controlling bacterial abundance and production in the middle Adriatic Sea

Šolić¹,

Krstulović²,

Vilibić³

et al. 2008

Marine Environmental Research

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“…These were realized under the favourable influence of high-salinity water intrusions. The physical-biotic coupling effect observed in July in the eastern part of the sampling region is highly relevant to the explanation of the appearance of a massive amount of mucilage that occurs periodically during summer in the northern Adriatic Sea (Najdek et al 2005, Russo et al 2005. Here, we have provided the first information on the effect of specific hydrographic conditions on the patterns of TEP distribution, though more intensive studies are necessary to verify the conclusions herein.…”

mentioning

confidence: 55%

Intrusion of high-salinity water causes accumulation of transparent exopolymer particles (TEP) in the northern Adriatic Sea

Najdek¹,

Blažina²,

Fuks³

et al. 2011

Aquat. Microb. Ecol.

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We present evidence that transparent exopolymer particles (TEP) accumulate in the northern Adriatic Sea as a result of the intrusion of oligotrophic high-salinity water (OHSW) from the south during summer. Samples were collected in June and July of 2007 in haloclines, and in the layers above and below them, at 2 stations in the region of the highest influx of OHSW. In June, we observed that concentrations of TEP in the upper part of the water column were 10 times higher at the eastern station as compared to the western station. This coincided with an intrusion of OHSW at the eastern station while the western station remained unaffected. In July, 2 stronger events involving OHSW encompassed both stations, leading to significant accumulations of TEP in the haloclines and in the layers above. Furthermore, during the period of maximal TEP accumulation, we noted pronounced increases in the abundance of diatoms and in bacterial numbers. These increases coincided with low cell-specific production of bacterial biomass, and a low abundance of actively respiring (CTC+) bacteria. In contrast, during the period of lower TEP concentration in the halocline, we observed an increase in the abundance of CTC+ bacteria, and in cell-specific β-glucosidase activity, probably indicating enhanced degradation of TEP in this layer.KEY WORDS: Oligotrophic high-salinity waters · Transparent exopolymer particles · TEP · Bacterioplankton · Production · Activity · Halocline · Northern Adriatic Sea Resale or republication not permitted without written consent of the publisherAquat Microb Ecol 63: [69][70][71][72][73][74] 2011 teria, actively respiring (CTC+) bacteria, bacterial production (measured by incorporation of 3 H-leucine and 3 H-thymidine) and β-glucosidase activity. MATERIALS AND METHODSSampling and basic parameters. During monitoring cruises aboard the 'Vila Velebita' research vessel, from May 10 to July 26, 2007, salinity was determined by CTD profiler (Seabird) at 14 stations of the Rovinj-River Po transect in the northern Adriatic Sea (Fig. 1). Samples for TEP determination were taken with Niskin samplers at the surface, and at depths of 5, 10, 20 and 31 m at Stn SJ103. During additional cruises, conducted on June 11 (Stn SJ105) and July 16 (Stns SJ103 and SJ105, Fig. 1), seawater was collected by SCUBA divers with Niskin samplers placed horizontally at 4 depths. Except for surface samples, the choice of sampling points was made according to salinity data obtained by the CTD profiler to correspond to the halocline layer and the water layers above and below it. For determination of chl a concentration, seawater was filtered through GF/C filters, extracted in acetone (90% v/v) and determined fluorometrically (Strickland & Parsons 1972). Microphytoplankton and TEP.For microphytoplankton counts, 200 ml samples were preserved with Lugol's solution and stored at 4°C. Microphytoplankton (i.e. cells or colonies > 20 µm) were identified and counted by an inverted microscope (Carl Zeiss) using the settling technique (Ut...

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Meteorological and oceanographic conditions in the northern Adriatic Sea during the period June 1999–July 2002: Influence on the mucilage phenomenon

Cited by 61 publications

References 15 publications

Behaviour and mortality of benthic crustaceans in response to experimentally induced hypoxia and anoxia in situ

Behaviour and mortality of benthic crustaceans in response to experimentally induced hypoxia and anoxia in situ

The role of water mass dynamics in controlling bacterial abundance and production in the middle Adriatic Sea

Intrusion of high-salinity water causes accumulation of transparent exopolymer particles (TEP) in the northern Adriatic Sea

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